If you follow the Zeta Gundam: A New Translation movies, you'll know that Kamille was NOT brain-fried like he was in the tv series... that and Axis retreated.. and they were the primary antagonist in Gundam ZZ. The third film had almost 80% new footage, because Tomino wanted to create a new rendition of his timeless classic.

That ending would SIGNIFICANTLY alter or completely re-write the storyline of Gundam ZZ, if Tomino ever decided to make a film compliation like he did with Zeta Gundam.